A trip straight down through the ocean, made for children aged 6 to 8 and hosted by Lupe, a golden retriever puppy who discovers everything alongside the child. Episode one teaches the sea as a building with five floors — the sunny floor, the dim one, the dark one, the deep deep and the trenches — and the ten episodes that follow walk down them one at a time, so the order of the course is the order of the journey. Along the way the child meets a turtle that breathes air and remembers the beach where she was born, a dolphin that sees by listening to echoes and sleeps with half his head at a time, a shark older than trees, an octopus with eight arms and no bones at all, fish that make their own light because no sunlight has ever reached them, and finally the deepest place on the planet, where a small white fish swims about quite happily. Every photograph is a real one, shown full-screen and held long enough to actually look at, and every size is honest: the blue whale is drawn against exactly twenty-five children in a row, because that is how long it really is. There are no exercises inside the videos and nothing to get wrong.